Developmental evolution of metazoan bodyplans¶
Valentine, J. W., Erwin, & Jablonski, D. (1996). Developmental evolution of metazoan bodyplans: The fossil evidence. Developmental Biology, 173(2), 373-381.
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Primes¶
- Hierarchical Decomposability
- At each level there are coherent units with high within-level coupling and bounded-nonzero cross-level coupling — the levels do interact (a hormone produced at the organ level affects molecular processes), but the cross-level coupling is weak enough that biologists can productively study one level at a time. This is hierarchical decomposability, not modularity alone — a single membrane-bounded cell is modular, but the recursive nesting across seven scopes with consistent within-level-dominates-cross-level coupling at each is what makes the organism tractably analyzable end-to-end, a structural commitment Valentine, Erwin, and Jablonski (1996) document across the evolution of metazoan body plans.
This sourceDocuments how the hierarchical level structure of metazoan bodyplans — cell type, tissue, organ, organism — emerged during the Neoproterozoic–Cambrian radiation through innovations in developmental control mechanisms including the Hox gene cluster.
- At each level there are coherent units with high within-level coupling and bounded-nonzero cross-level coupling — the levels do interact (a hormone produced at the organ level affects molecular processes), but the cross-level coupling is weak enough that biologists can productively study one level at a time. This is hierarchical decomposability, not modularity alone — a single membrane-bounded cell is modular, but the recursive nesting across seven scopes with consistent within-level-dominates-cross-level coupling at each is what makes the organism tractably analyzable end-to-end, a structural commitment Valentine, Erwin, and Jablonski (1996) document across the evolution of metazoan body plans.
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